Dns

{
  "domain": "example.com",
  "propagation": {
    "propagated": true,
    "resolvers": [
      {
        "answered": true,
        "answers": [
          "93.184.216.34"
        ],
        "resolver": "Google"
      }
    ]
  },
  "receipt": {
    "algorithm": "ed25519",
    "key_id": "…",
    "receipt_id": "01J…",
    "signature": "…"
  },
  "records": {
    "A": [
      "93.184.216.34"
    ]
  },
  "verdict": "propagated"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://sentinel.rootstuff.io/x402/dns?domain=example.com&type=A'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://sentinel.rootstuff.io/x402/dns?domain=example.com&type=A' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.01 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.01" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.01 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fsentinel.rootstuff.io%2Fx402%2Fdns
const res = await pay("https://sentinel.rootstuff.io/x402/dns?domain=example.com&type=A");
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.01 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.01"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://sentinel.rootstuff.io/x402/dns?domain=example.com&type=A")
    print(res.status_code, res.text)